Automatic tuning system for radio sets



July 8, 1941. c. F. PETERS AUTOMATIC TUNING SYSTEM FOR RADIO SETS FiledSept. 24, 1938 4 Sheets-Sheet 1 HHHEIHH 0 Q 6 QOU INVENTOR CHARLES]?PETERS ATTORNEY July 8, 1941. c. F. PETERS AUTOMATIC TUNING SYSTEM FORRADIO SETS Filed Sept. 24, 1938' 4 Sheets-Sheet 3 lNVENTOR CHARLESEPETERS A RNEY 1941- c. F. PETERS AUTOMATIC TUNING SYSTEM FOR RADIO SETSFiled Sept. 24, 1938 4 Sheets-Sheet 4 FmAL OFF B I RADIO INVENTORCHARLES E P15 TERS M AT ORNEY Patented July 8, 1941 AUTOMATIC TUNINGSYSTEM FOR RADIO SETS Charles F. Peters, Great Kills, Statenlsland, N.Y.

Application September 24, 1938, Serial No. 231,458

Claims.

The present invention relates to tuning and tuning control systems andit particularly relates to automatic tuning and tuning control systemsfor radio reception apparatus.

Although the present invention will be particularly described andillustrated in-connection with its application to a home radio set, itwill be apparent that it may have other applications in controlling orregulating radio sets and in tuning or adjusting various types ofequipment'other than radio receiving sets which is to be set in apredetermined fashion at different time intervals and for differentperiods.

It is among the objects of the present invention to provide aninexpensive, reliable, automatic timing and tuning arrangements for homeradio sets or for other equipment which it is desirable to adjust in apredetermined manner at different times and for different periods, whichwill be relatively simple and inexpensive, be readily operable byavailable equipment from the usual sources of electrical power and whichmay be readily adjusted or repaired and which may be made in a separateunit for attachment to a radio set.

Another object is to provide a simple, durable, inexpensive andautomatic station and time control for a home radio station, which willautomatically tune indifferent stations for "different programs withoutmaking it necessary for the householder or owner of the set manually toturn oil" the program at its termination, or without the necessity ofutilizing complicated, expensive and intricate control mechanisms andcircuits readily subject to derangement.

In accomplishing the above objects it has been found most satisfactoryto provide a clock control which may be positioned in the radio setequipment or which may be positioned at some other point, which controlwill be provided with a contact or electrical circuit closer armconnected to or moving with the hour hand over a dial.

The dial may carry a plurality of contact elements or holders,preferably arranged in concentric circles and in radial rows, a radialrow of contact holders being provided for each quarter hour and aseparate concentric circle of contact holders being provided for each ofthe stations to be tuned in. Two extra circles are also provided, onefor the end of the program and the other for turning off the set when itis not desired to receive any further programs.

Although various forms of contactors may be positioned upon this dial tocooperate with the swinging contact arm moving with the hour hand atpredetermined quarter hour intervals and corresponding to predeterminedstations, it has been found most desirable according 'to one embodimentof the invention to provide aseries of radial and concentric rows ofholes in a dial of an insulating material, which holes are provided withthreaded or resilient-grip eyelets to receive contact plugs which strikeor contact with a moving element on the hour hand shaft-of the clock,

A transformer may be used to step down the available or '220 volt supplywhich transformer may be connected at one side to the clock control.

In one desired construction the contact at the clock will energize oractuate a circuit leading from a transformer to a switch or to relays,which cause a motor to be switched on. The set may be turned onsimultaneously or only after the motor has tuned the set to the desiredstation. The motor may operate a rotary switch device having a rotatingarmor arms and a plurality of relatively fixed elements or switchelements corresponding to the stations which are to 'be tuned 1n.

One of the elements may provide a circuit from the transformer passingthrough the clock control to start the motor. Another elementstops themotor when the set has been tuned to the desired station. Additionalswitches may be used to provide predetermined capacities in the radioreceiving circuit corresponding to the various stations.

When the contact arm moving with the hour hand contacts a plug at theend of the radio program circle, the radio set will be switched off andwhen it contacts a plug in the final stop circle, the set willautomatically be switched off. This will avoid repetition of programs inthe next twelve hour period. A manual switch may also be provided toswitch the set on and off manually or to turn on or off the automaticarrangement at any desired time or interval.

At the same time, if desired, the arrangement described may becontrolled by providing buttons or manually controlled elements, one foreach station, at an adjacent point or at a remote point to tune in adesired station without adjustment or manipulation of either the dial orthe various knobs of the set.

In the preferred construction there is also provided an arrangement bywhich the variable condenser may be tuned to a zero positionautomatically without need of manual control.

In the construction as shown and described it will be possible to throwthe set from automatic to manual control by a readily available buttonor lever arrangement.

Referring to the drawings which show one form of the constructionaccording to the present invention, but to which the present inventionis by no means restricted, since many changes and variations may bemade, all within the scope thereof:

Figs. 1a and lb represent diagrammatically the circuit arrangements ofthe tuning and timing control system of the present invention which maybe utilized for tuning the radio set to a predetermined station, wavelength or frequency from a remote point or directly at the set, Fig. 1ashowing the left hand side of the arrangements and Fig. lb showing theright hand side of the arrangements.

Fig. 1c is a diagrammatic showing of a portion of the arrangements asconnected to the various condensers.

Figs. 2 and 3 are fragmentary elevational views of a portion of thecontrol dial upon an enlarged scale as compared to Fig. 1a, Fig. 2 beinga front view and Fig. 3 being a rear view.

Fig. 4 is a fragmentary transverse sectional view upon the line 4-4 ofFig. 2 and upon an enlarged scale as compared to Fig. 2.

Fig. 5 is a transverse sectional view upon the line 5-5 of Fig. 4.

Fig. 6 is a diagrammatic view in elevation illus- Figs. 7 to show analternative installation,

Fig. 7 being a diagrammatic lay-out similar to Figs. 1a and lb, Fig. 8being an enlarged diagrammatic showing of the rotary switch shown insmaller scale at the right of Fig. 7, Fig. 9 being a transversesectional view upon the line 9-9 of Fig. 8, and Fig. 10 being a rearsectional view upon the line Ifll0 of Fig. 9.

Referring to the drawings, the radio set A is provided with the mainswitch B which permits either manual or automatic control as may bedesired.

The main control dial C is associated with the clock D. The clock isprovided with an extra arm E which controls circuits to the motor F andthe circuits to the motor on and off relay G and the radio set orprogram on and off relay H. The relays G and H are so constructed thattheir armatures will remain in operative position after the magnets aredeenergized.

The transformer I is positioned in said circLL'ts to reduce the 110voltage obtained from the 1 source of supply J. The rotary or dialswitches K and L control the tuning to a station, K being the motor stopswitch and the switch L being the motor start switch.

The rotary or dial switches M and N select the fixed condensers shown ingroups or banks at O and P. It has been found most convenient to connectfixed condensers in groups or banks of two for each station. These fixedcondensers may each be adjusted to bring in the particular station withthe desired volume and then they may be set so that thereafter they willnot be varied.

The variable condenser Q may be controlled so that it will be turned tozero by means of the driving connection R. The variable condenser Q isturned to zero and rendered inoperative When the fixed condensers O andP are being utilized and/or when such fixed condensers are beingadjusted to bring in the stations with proper volume.

The switches K, L, M and N are driven from the motor F through thereduction unit S.

The dot-and-dash line circuits shown upon Fig. 1a lead to the remotecontrol elements T, by which the tuning of the set may be accomplishedwithout setting the disk C.

Referring specifically to Figs. la and lb, the disk C may consist of acircular panel In having the concentric rows of spaced openings l I, l2,l3, l4, l5, I6, I! and 18, which are arranged at quarter hour intervals.Each row of the circles, with the exception of the two innermost rows lland I8, may correspond to a station.

For example, as indicated upon Fig. 2, th row Il may correspond to afrequency of 650 or station WEAF. The row 12 may correspond to afrequency of 710 or station WOR. The row l3 may correspond to afrequency of 810 or station WNYC.

The row l4 may correspond to a frequency of 860 or station WABC. The row[5 may correspond to a frequency of 1010 or station WHN. The row l6 maycorrespond to a frequency of 1550 or station WQXR.

The row I1 may correspond to the end of the program or to theintermediate stop, while the row It! may correspond to the finalshut-off of the set.

As indicated best in Fig. 4, a metal eyelet I9 is inserted in each ofthe openings and the front edges are turned or hammered over asindicated at 20. The rear end of the sleeve, as indicated at 2|, is alsoturned over to engage a wire 22 which extends over all the eyelets ineach of the concentric rows l l to l8, respectively.

These eyelets l9 are each designed to receive a pin or plug member 23which has a disk portion 24 to be stopped against and to contact withthe bent over portion 20 of the eyelet l9. These eyelets may be threadedfor threaded plugs.

The plug 23 is also provided with the hand grip portion 25 and with theslot 26 on its long shank 21 to give it resiliency and permit it to betightly grasped in the opening of the sleeve l9, since the split insideend portions of the plug 23 will normally be further spaced than theinternal diameter of the sleeve 19. The center of the disk may beprovided with the sheet metal holder member 28 which may receive a clockmechanism D, as best shown in Figs. 1a and 6. It will be noted that thesupport 28 has the upturned edge portions 32 and 33 for holding the dialC in position.

As shown in Fig. 6, the dial C and the clock mechanism D may be mountedupon the panel or front 29 of a usual radio set. The panel may alsocarry a manual push button tuning arrangement having the button elements3|.

The clock D, which may also have a minute hand, is shown as having anhour hand 34 only, since this hand is used to control the operation ofthe circuits.

On the shaft of the hour hand and moving with the hour hand is carriedthe radial swinging switch element E. The element E has a bar or rod 35and a sheet metal member 36 which has a turned over portion 31 toembrace said rod 35. The sheet metal member 35 is normally pressed inthe direction indicated by the arrow 38 by resilient means or by aspring (not shown).

When it is moved against the extension 21 of the plug 23, it is forcedin the direction 39 until it is pressed sufficiently back to pass theplug 23, in which case it will be snapped back into position. Beforethis occurs, however, the set will have been tuned to the desiredstation by the radial switches K to N, the motor F and therelays G andH.

The contact of the swinging plate 36 with the plug 23 as shown in Fig.5-willturn on the radio set and also establish the motor startingcircuit.

At the base of the clock is provided a clock switch V for connecting the110 volt source to the set, whichswitch is shown diagrammatically inFigs. 1a and 5 to simplify the showing, since its detailed constructionforms no part of the invention. The actuating mechanism for the switch Vmay be so constructed that elements thereof travel around with the arm Ein order that it may be in position to be actuated by said arm wheneversaid arm contacts with the plug and is actuated in the manner shown inFig. 5.

As the arm E rotates the first contact will be made with the pin 23,establishing the circuit with the wire connection 22 running around thecircle II to I B, as the case may be. Then the flange 35 will close theswitch V, connecting the transformer I to the 110 volt source J in themanner which will be more fully described. During this period the clockis moving in the direction indicated by the arrow 40.

As indicated diagrammatically upon Fig. 1a and Fig. 5, the transformer Ihas the primary 4I having the lines 42 and 43, 42 passing to the 110volt source J and 43 passing to the clock switch V.

From the clock switch V there is another lead 44 back to the set switch13 and the lines 250 and 25I to the 110 volt source. From the secondary45 of the transformer there is a connection 46 to the lead 41 to the armE.

Each of the wires 22 connecting the eyelets in each of the circles II toI8 together is provided with a lead designated respectively 48, 49, 50,5I 52 and 53.

These leads correspond respectively to the circles II to It on thedials. These leads are respectively connected as indicated upon Fig. 1bby the leads or connections 54, 55, 55, 51, 58 and 59 to the pointsnumbered I to VI upon the insulating dial 60 of the switch K and by theconncctions 60, GI, 62, 63, 64 and 65 to the connections numbered I toVI upon the insulating dial "I of the switch L.

The switch K is provided with a single radial contact finger 68. Theswitch L isprovided with five radial contact fingers 69, which contactthe points not contacted by the finger 68. These fingers 68 and 69 allturn with the shaft I- and are in electrical connection with lines 'IIand. I2.

leading to the relays G and H. The switch K through the line H controlsthe relay G to stop the motor and the relay H turns on the set when thedesired station has been tuned in. The switch L through the line I2controls the relay G to start the motor upon making a contact at.

the clock.

Referring again to Fig. la, the radio or program on and off relay isprovided with an upper electro-magnet I3 for the on position and thelower electro-magnet I4 for the off position.

Operated by the electro-magnets is the armature I which is shown in theofi or down position.

The motor start and stop relay G is also provided with an upper onelectro-magnet I6 and a lower oil electro-magnet I1 and with thearmature I8 which is shown in down or off position.

The secondary 45 of the electro-magnet is provided with the leads I9 and19, which are connected to one side of the motor F. The other side ofthe motor is connected by a lead 80, the

nection. 8-1 and 46 to the other side of the secondary'45 of thetransformer.

The motor F drives the shaft III by the shaft I12, the worm, I13 and thegear wheel I14.

Whenv the motor is not operating, the armature 'IBis down, opening thecircuit between the contact points 82. To operate the motor F it isnecessary to energize the motor-on electro-magnet I6.

The circuit of this motor-on element I6 from the secondary 45 includesthe connection I9, the connection 83, the electro-magnet 16, theconnection 84', the armature I8 which closes the contact points 86, theconnection 85, and the connection 12, which forms part of the clockcircuit as already described.

When the motor-on electro-magnet 15 is energized, the armature will bedrawn upwardly, opening the circuit across the contact points 86 andclosing it across the contact points 82 and this will close the motorcircuit and cause the motor to operate.

As soon as the motor has turned to a predetermined station, a circuitwill be established through the connections II and H the contact points81, the armature I8, the connection 88, the electro-magnet I1, and theconnections 89 and I9 to the secondary 45.

It will. be noted by reference to the switches K and L that it will benecessary to turn the arm 68 to the desired station I to VI and the arms69 to omit the desired station I to VI before the motor will be stoppedthrough operation of the relay G.

At this time, a circuit will be established through the clock circuit bythe arm 68 and the lines II and II, the switch I53--I55, the line I03,the contacts I02, the line IN, the radio-on electro-magnet I3, the linesI00 and I9 to the secondary 45 turning on the radio across the contacts256.

The contacts 256 are in the V set circuit consisting of the lines 252,253, 254, 255, the contacts 256, the line 257, the switch B, and thelines 250 and 25I.

As shown in Fig. 11), it may be regarded that the motor has-turned theswitches K and L to tune in station I, which may be WEAF, and that themotor has stopped. The program then continues to come in from WEAF orstation I until the set is turned. off by. contact of the arm E with aplug 23 on the stop circle IT.

The stopping of the program is controlled primarily' by the radio relayswitch H. This switch H is. provided with the circuit consisting of theconduit I9, the lead 95, the electro-magnet I4, the lead 96, the contactpoints 91, the armature I5, the leads 99 and 99 to the stop circle I1.

When the set is operating the armature I5 will normally be up, closingthe contact points 91'. The circuit thus established would energizetheelectro-magnet l4,ipulling down the armature I5 and throwing thearmature I5 to ofi position and discontinuing, the radio receiver.

The final off circle I8 is connected to the set switch B. The switch Bis provided with the handle I04 having the pointer I05, which may beturned off or tomanual or automatic positions.

The casing. I06 includes a coil carrying the armature I01, which isdesigned to close circuits across, eitherthe contact points I08 or thecontact points I09 by its contact faces orplates H0 and III,respectively.

, Upon starting when the pointer I05 has -been armature 18 across thepoints 82, and the conturned to A or to automatic operation the plate II is thrown into the dotted line position, closing the contacts I08, acircuit will be established th ough the clock switch V and the leads 43and 44. Upon final stoppage, a circuit will be established from thesecondary 45 through the lead H2, coil of B the lead H3 and the lead H4to the circle I8. The other side of the circuit is formed by the leads46 and 41 and the arm E. This will restore the plate H0 to full lineposition.

With manual operation, however, when the contacts I09 are closed by theplate III, the set may be tuned directly by the various knobs H5,

H6, H1 and H8 shown in Fig. 6.

The fixed condensers O and P are provided and are connected in pairs bymeans of the switches M and N.

The fixed condensers I and IZI correspond to station I of circle II. Thefixed condensers I22 and I23 correspond to the circle I2. The fixedcondensers I24 and I25 correspond to the circle I3.

The fixed condensers I26 and I21 correspond to the circle I4. The fixedcondensers I28 and I29 correspond to the circle I5, and the fixedcondensers I30 and I3I correspond to the circle I6.

These condensers are respectively connected to the contact points I toV1 on the switch M and I to VT on the switch N by means of the leads orconnectors I32 and I33, I34 and I35, I36 and I31, I38 and I39, I40 andI4I, I42 and I43.

The leads I44 and I45 are connected respectively to one side of each ofthe banks of fixed condensers O and P and these leads I44 and I45 arealso connected to the plates or sides I46 and I41 of the manuallycontrolled variable condenser Q. The other plates I49 oi the manuallycontrolled variable condenser Q have connections to the lines I51 I51and I51 and also to the ground I48 through the line I49.

The variable manual control condenser Q is provided with the main drivewheel I5I which is connected by the shaft I10 to the shaft I1I of thevariable condenser elements. Ordinarily the variable condenser Q, asbest shown in Fig. 1b, is turned to zero by the friction drive wheel Ion the shaft 10 which presses against and turns the friction drive wheelI5I until stopped with the contact elements I52 and I53 closed againstthe contact points I54 and I55. At this point the variable condenser Qwill be in zero position. This will establish circuits through theconduits or connections I56, I56, I51 and I51, and 1|, I58, I59 and Hrespectively. It is apparent that the motor F will not be stopped untilthe circuit has been closed across the contacts I by the contact plateI53 and after the circuit has once been closed at the contacts I55, thefriction roll I50 will slide upon the main roller I5I Further movementof the roller I5I is prevented by the abutment between the plate I53 andthe contacts I55. After the plate I53 touches the contacts I55, themotor F will continue to operate until the switch elements 68 and 69 ofthe switches K and L have been turned to proper position.

The switches M and N are also each provided with the stationaryinsulating disks I60 and I6I carrying the metal points I to VI, whichare designed to cooperate with the arms I62 and I63, the arms turningwith the shaft 10 until the con nection at the predetermined station Ito VI has been made.

As an optional remote control unit, one switch may be provided for eachstation and for the stop, these switches being indicated at the top ofFig. 1a.

These switches are respectively provided w h manually actuated contactelements 200, MI, 202, 203, 284, 205, 206 corresponding respectively tocircles II to I1. Each of these switches are provided with four contactpoints 201, 208, 208, 2I0, 2H and 2I2. The third point on each one isconnected to the respective circles II to I1 by the leads 2I3, 2I4, 2I5,2I6, 2I1, H8 and 222.

The last point on each switch 200 to 206 is connected to the arm E bythe lead 2I8. The first point is connected by the lead 220 to one sideof the volt source J, while the second point is connected by the leads,22I and 43 through the primary 4| of the transformer.

In automatic operation the manual switch B will be thrown with thepointer I05 to A, indicating automatic position and causing the plate H0to close the contact points I08, as indicated in dotted line position inFig. 1a. The user of the set then may adjust the dial C in the followingmanner.

For example, it may be desirable to tune in the station WEAF at 12oclock, as indicated by the plug 23, being inserted in position in Figs.2, 3 and 4. As soon as the arm E hits the plug, as shown on Figs. 4 and5, it will press the flange or plate 36 over into the dotted lineposition, as shown in Fig. 5, closing the clock switch V.

This will energize the primary 4I through the circuit 42, 43, 44, thecontact points I08, the contact plate I I0 and the lines 250 and 25I'.This circuit extends to and from the 110 volt source J.

As soon as the primary 4| is energized, the secondary 45 will establisha circuit through the lines 46, 41, the swinging arm E, the contact plug23, the wire 22 extending around the eyelets in the circle II, theconduit 48, the conduit 60 to the contact point I on the dial 61 of theswitch L.

If the station I, that is WEAF, has been previously tuned in, as isindicated by the position of the arms 68, I62 and I63 on the switches K,M and N, there will be an open circuit at the switch L and the motor Fwill not turn, since the set will already be in tune, but the radio setwill be turned on by the circuit via arm 68, lines H and I58, contactsH5, lines I59, H and I03, contacts I02, line IOI, solenoid 13, lines I00and 19 and the secondary 45.

However, if another station other than the station I, corresponding toWEAF, has been tuned in, one of the arms 69 will be against the contactpoint I of the switch L and the circuit will continue through the line12, the line 85, the contact points 86, the line 84, the motor-on magnet16 of the relay G, the line 83 and the line 18 back to the secondary 45.

Energization of the magnet 16 of the motor on-ofi relay G will swing thearmature 18 to upper portion closing the contacts 82, which willestablish the circuit to the motor F. This circuit extends from thesecondary 45 through the lines 46, 8|, the contacts 02, the armature 18,the line 80, the line 19, and the line 19.

The motor then having started rotating will continue to rotate, drivingthe shaft 10 through the worm I13 and the gear I 14 until the arms 68,I62 and I63 have been turned to the new station which is to be tuned in.

At this time the arm 69 on the switch L will be out of contact with thecontact point correthrowing the pointer I back to oii position andsponding to the station tuned in and in contact with every other contactpoint upon the dial L.

When the motor has tuned the set to the desired station, a circuit willbe established through the electro-magnet 11 by the arm 68 of the turneddown y the connection between the friction disks I50 and I5I to tune thevariable condenser Q to zero) the line I59, the line H, the line H thecontact points 81 and the armature 13, the line 88, the lowerelectro-magnet 11 of the motor on-oil relay G, the lines 89 and 19' backto the secondary 45.

The period of contact of the arm E with the plug 23 is sufficient topermit of this tuning operation.

At the same time that the station has been tuned, a circuit will beestablished through the lines 46, 41, the swinging arm E the lines 48,54,

the arm 53, the lines II, I58, the contact points I55, I59, the lines1I, I03, the contact point I02,

the line IIiI, the electro-magnet 13 and the lines 7 I55 and 19 back tothe secondary 45.

This last circuit will swing the armature to upper position. In suchupper position a circuit will be established to the radio set A from thesource J through the lines 252, 253, 254, 255, L

the contact points 255, the line 251, the contact point I08, the lines258, 25I and back to the source J.

When tuning has been completed for station WEAF or the stationdesignated Lit will be noted that. the arms I52 and I63 are in contactwith their contact points, as indicated at I. This will connect in thecircuit of the set the two fixed condensers I25, I 2| which have beenadjusted to bring in the station WEAF or I with the proper volume.

It will be noted that the condensers are con nested in pairs by thecontact element I52 upon the element R, which will have been turned downto establish connection between the lines I56 and I51 by the frictiongear I50, I5I. In manual operation the switch I54I'55 will be open.

It will be noticed that the condenser circuit for the station WEAF or Iconsists of the contact points I54, the lines I56 and I51, the lines Iand I51, the line I51 the arms I62 and I53, the lines I32 and I53, thecondensers I20 and I2I, the lines I44 and I45, the plate I41 and theline I51 Upon contact with a plug which has been placed upon the end ofthe program circle I1, the electro-rnagnet 14 will be energized,breaking the radio set circuit, previously described, through the lines46, 41, the arm E, the neXt to the innermost circle I1, the line 99, theline 98, the contact points 91, the armature 15 (which is in up positionwhen the set is operating), the line 96,

the electro-magnet 14, the lines 95 and 19.

However, when the arm E meets a plug in the final shut-off circle I8, acircuit will be established from the secondary 45, the line II2, thecoil (not shown) of the switch B, the lines I13 and H4, the arm E andthe lines 41'and 46 back to the secondary 45.

This will have the effect of automatically station at the desiredmoment. accomplished without providing any plugs or admoving the plate II0 from dotted line to full line position-as shown in Fig. 1a, openingthe circuit of the clock switch, V, which will then be thrown back toits initial position.

In 'a similar manner by providing the remote control "buttons Ito VII,as indicated at the top of Fig. 1a, the set "may be tuned in at adesired This may be justing plugs in the dial C.

For example to tune station I or WEAF, a circuit 'will be establishedthrough the dot-andda'sh lines, indicated at 220 and HI, which willclose the power circuit of the primary I.

At the same time the circuit ordinarily established by the contact 23 inthe circle II will be established by the button 200 making connectionbetween the dot-and-dash lines 213 and 2I9. The "rest of the circuitswill remain the same. When it is desired to turn'the set off, this maybe accomplished by means of the manual switch B or a new button I to VIImay be pressed to tune in a new station.

It is thusapparent that the applicant has provided a simple, inexpensivecontrol system for enabling remote or adjacent control of a radio set totune in apredetermined station at desired time intervals and for periodsas may be desired.

The automatic tuning system may be readily associated with a'radio s'et,as indicated in Fig. 6, and the buttons 200 to 206 may be placed uponthese't orat a remotepoint. The system is readily adjusted, correctedand repaired.

Referring to the embodiment in Figs. 7 to 10, the relay G has beenomitted and the switch construction K and L has been somewhat compacted.In the construction of Fig. 7 correspondingly functioning parts as thosein Figs. 1 to 5 are indicated by the same numerals prime.

Briefly referring to Fig. 7 the said switch V,

the transformer I, the switch 13', the radio on and off relay H and theradio set A function substantially in the same manner as previouslydescribed.

For purposes of simplicity of showing however only circles for fivestations are provided on the dial 0 and the contact arm A is of the sameconstruction as already described in connection with Figs. 4 and 5. Theessential difference betweenthe construction of Figs. 7 and 10 and thatof the construction of Figs. 1 and 5 resides in the construction of theswitch shown in small scale a 206 which is positioned opposite to thecontact 201 on the dial 208 and when the button 203 is in contact withthe pin 204 these contacts 206 and 201 willbe separated opening thecircuit as shOWn at the upper portion of Fig. 9. However, usually thecontacts will be closed as indicated at the lower portion of Fig. 9.

The spider 209, which carries the arms 205, also has a sleeve 2I0 whichcarries the arms 2I I, 2I2, 2I3 and 2I4. The arms 2H and 2I2 areprovided with the contacts 2I5 while the arms 2I3 and 2I4 are providedwith the contacts 2I6. The insulating blocks 2I1, 2I8 and 2I9 areprovided to assure that there will be no electrical connection betweenthe arms 211 and the spider 209 and the arms 212 and 213. As indicatedin the lower portion of Fig. 9 the contacts 215 and 216 will beseparated, unless the presser member 283 on the arms 202 contacts thelower main pin 2134. When this occurs the contacts 215 and 216 will beclosed, and the contacts 206 and 201 at the lowermost part of the discs208 will be opened.

In operation, when a circuit is closed on the dial C say for examplecorresponding to the station I, the circuit will extend from thesecondary 45 to the arm E to the line 48 to the contacts 2E5, 201,corresponding to the arm I of Fig. '7 to the conduit 22!] through theupper electro-rnagnet '13 by means of the conduits 100 and 161 andthrough the line 221 back to the secondary 45. The electro-magnet '13when energized will lift the armature '15 closing the circuit across thecontacts 258 and starting the set.

The motor F also will be energized by means of the connections 222 and223 which are also upon this circuit. The motor will turn the arm 282until contacts at position I are opened and at this time the motorcircuit will be opened and the motor will stop. When a plug ispositioned at the end of the program circle or the final circle thecontacts 215 and 216 will be actuated when the arm 202 moves tolowermost position on the dial, namely, position indicated at S. In thisposition the contacts 215 and 216 will be closed and the contacts 206and 207 will be opened. When the plug is in the end of the programcircle, the switch 215 will energize the electro-magnet l4 switching offthe set in the manner previously described. When, however, the plug isin the final circle the switch or contacts 216 will be closed and thiswill energize the electro-magnet B so as to move the contact plate 1 1 Ifrom upper to lower position.

It will be apparent that plugs should be placed both in the end ofprogram circle and the final circle when the radio set is to be turnedoff.

As is indicated upon contact with a plug in the end of the programcircle, a circuit will be set up through the line 260, the closedcontacts 20620'l at the position S on the switch of Figs. 8 to 10. Thecircuit will then continue through the line 220 to the motor F and backto the secondary 45. arm 2B2 moves to position S, at which time thecontacts 206201 at position S will be opened, stopping the motor and thecontacts 215 and 216 will be closed.

When the contacts 216 are closed, the lower electro-magnet '14 will beenergized, drawing the armature l5 downwardly and opening the circuitacross the contacts 255.

The final off-switch B, however, will not be operated unless there isalso a plug in the final circle. If there is such a plug in the finalcircle, the movement of the arm 202 to the position S will close theswitch 216, energize the electro-magnet 106, and move the contact plate110, from full line position down to the dotted line position, shuttingoff the set. The operation of the switch B prevents repetition of thesame programs during the next twelve hours.

It is, of course, possible to eliminate the final circle where theswitch B is manually operated or where the set will be automaticallyturned off by outside arrangement not shown.

It will be noted in connection with both the switches of Fig. lb andFigs. 8 and 9, that these switches both present a closed circuit to theThe motor will turn until the motor control relay G or to the motor F,which is open at the clock. As soon as the plug in a desired circlestrikes the arm E or E, this circuit will be closed and the motor willturn the switch to the position corresponding to the station to be tunedin.

When this is accomplished the motor circuit will be opened and the motorwill stop. In the switch shown in Fig. 1b, the set may be turned offwith the rotary switch in any position, while in the construction ofFigs. 8 to 10, the switch arm 202 must always be vertically downwardlyin the position S when the set is turned oif. This last mentionedposition S in the embodiment of Figs. 7 to 10 may be regarded as aneutral position.

The operation other than just described is the same as previouslydescribed in connection with Figs. 1 to 6, and if desired, the otherattachments designated with M, N, O, P, Q, R and T, can also be includedin the arrangement of Figs. '7 to 10.

It is to be understood that other tuning means, impedances, or reactorscould be utilized in lieu of the fixed condensers O and P and thevariable condenser Q for tuning the set. It is also to be understoodthat other types of switches than the relays G and H could be used forturning off and on the motor and the radio set. Other types of circuitselectors could also be utilized in lieu of either the manual selectorindicated at the top of Fig. 1a or the clock selector indicated at theupper central portion of Fig. la.

As many changes could be made in the above construction, and manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrative and not in a limiting sense.

What is claimed is:

1. In combination with a radio set, a tuning arrangement comprising aclock driven contact element, a motor for tuning the set to apredetermined station, a switch for starting and stopping the motor,establishing a motor circuit to start the motor when said motor isstopped and cutting off the motor circuit when the desired station hasbeen tuned in, a switch for turning on and off the set establishing acircuit to turn on the set when the motor has tuned the set in to thedesired station and establishing a circuit to turn off the set at theend of the program and connecting circuits actuated by said contactelement to control said switches, said circuits including a rotatingswitch having a plurality of contact points one for each station to betuned, each of said points establishing a circuit to actuate the motorswitch to motor starting position except the point corresponding to thestation to be tuned in, said last mentioned point establishing a circuitto actuate the motor switch to motor stopping position, said contactelement including a contact arm and a dial of non-metallic materialhaving concentric and radial rows of contact points corresponding tostations and time intervals, said points cooperating with said arm.

2. In an automatic tuning installation for a radio receiving set, aplurality of selectively energized circuits, one circuit correspondingto each station to be tuned in, means to select and cause energizationof one of said circuits, manually controlled variable tuning means, aplurality of fixed tuning means, one for each station to be tuned in,and control means responsive to the energization of the selected circuitto set said manually controlled tuning means to zero and to select afixed tuning means corresponding to the station of the circuit which hasbeen 5 selected and energized.

3. The installation of claim 2, said control means including a motoroperated upon energization of one of said circuits, and a switchactuated by said motor provided with a plurality 10 of spaced circuitclosing contacts respectively corresponding to each of said pluralityoi. selectively energized circuits.

4. The installation of claim 2, said means to CHARLES F. PETERS.

